Description: This is the updated 2007 boundary for the South Tacoma Groundwater Protection District. The South Tacoma Groundwater Protection District (STGPD) was created to protect an important source of water for Tacoma. The district border includes a mostly industrial area. This area is on top of the South Tacoma aquifer. This aquifer provides up to 40% of Tacoma's water in the summer and adds to Tacoma's water supply the rest of the year. See Tacoma Municipal Code 13.09.